data_global _chemical_name_mineral 'Muscovite' loop_ _publ_author_name 'Comodi P' 'Zanazzi P F' _journal_name_full 'Physics and Chemistry of Minerals' _journal_volume 22 _journal_year 1995 _journal_page_first 170 _journal_page_last 177 _publ_section_title ; High-pressure structural study of muscovite Sample: Na-Ms, P = 2.7 GPa ; _database_code_amcsd 0007911 _chemical_formula_sum 'K.6 Na.37 Al2.8 Ti.02 Fe.1 Mg.04 Si3.04 O12 H2' _cell_length_a 5.130 _cell_length_b 8.886 _cell_length_c 19.241 _cell_angle_alpha 90 _cell_angle_beta 95.5 _cell_angle_gamma 90 _cell_volume 873.066 _exptl_crystal_density_diffrn 3.001 _symmetry_space_group_name_H-M 'C 1 2/c 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,z' 'x,-y,1/2+z' '1/2+x,1/2-y,1/2+z' '-x,y,1/2-z' '1/2-x,1/2+y,1/2-z' '-x,-y,-z' '1/2-x,1/2-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy _atom_site_U_iso_or_equiv K 0.00000 0.09550 0.25000 0.60000 0.01620 Na 0.00000 0.09550 0.25000 0.37000 0.01620 AlM2 0.24760 0.08300 -0.00050 0.92000 0.00160 TiM2 0.24760 0.08300 -0.00050 0.01000 0.00160 FeM2 0.24760 0.08300 -0.00050 0.05000 0.00160 MgM2 0.24760 0.08300 -0.00050 0.02000 0.00160 SiT1 0.96440 0.42730 0.14060 0.76000 0.00510 AlT1 0.96440 0.42730 0.14060 0.24000 0.00510 SiT2 0.45000 0.25760 0.13860 0.76000 0.00770 AlT2 0.45000 0.25760 0.13860 0.24000 0.00770 O1 0.95630 0.44590 0.05550 1.00000 0.00350 O2 0.38420 0.24920 0.05340 1.00000 0.01250 O3 0.40240 0.09460 0.17610 1.00000 0.01790 O4 0.75360 0.30440 0.16520 1.00000 0.01420 O5 0.25940 0.37220 0.17590 1.00000 0.00790 O-H 0.94960 0.05980 0.04840 1.00000 0.00620